fix(core): add nullish operator to check visibility (#1942)

* fix(core): add nullish operator to check visibility

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

* chore(changeset): add

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

---------

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

Author: bcakmakoglu

.changeset/six-adults-jam.md

@@ -0,0 +1,5 @@
+---
+"@vue-flow/core": patch
+---
+
+Add nullish operator to checkVisibility call

packages/core/src/composables/useResizeHandler.ts

@@ -16,7 +16,7 @@ export function useResizeHandler(viewportEl: Ref<HTMLDivElement | null>): void {
 
   onMounted(() => {
     const updateDimensions = () => {
-      if (!viewportEl.value || !(viewportEl.value.checkVisibility() ?? true)) {
+      if (!viewportEl.value || !(viewportEl.value.checkVisibility?.() ?? true)) {
         return
       }